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2008-05-31x86: move x86-specific documentation into Documentation/x86H. Peter Anvin12-0/+0
The current organization of the x86 documentation makes it appear as if the "i386" documentation doesn't apply to x86-64, which is does. Thus, move that documentation into Documentation/x86, and move the x86-64-specific stuff into Documentation/x86/x86_64 with the eventual goal to move stuff that isn't actually 64-bit specific back into Documentation/x86. Signed-off-by: H. Peter Anvin <hpa@zytor.com>
2008-05-31x86: update Documentation/i386/boot.txtH. Peter Anvin1-33/+46
Document QUIET_FLAG, correct the definition of several fields, make it clear this applies to the entire x86 architecture, not just i386. Signed-off-by: H. Peter Anvin <hpa@zytor.com>
2008-05-24ibmaem: new driver for power/energy/temp meters in IBM System X hardwareDarrick J. Wong1-0/+37
This driver reads IBM Active Energy Manager energy/temperature/power sensors on IBM System X hardware. [akpm@linux-foundation.org: fix printk warnings] Signed-off-by: Darrick J. Wong <djwong@us.ibm.com> Cc: "Mark M. Hoffman" <mhoffman@lightlink.com> Cc: Corey Minyard <minyard@acm.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-05-24fuse: fix bdi naming conflictMiklos Szeredi1-0/+4
Fuse allocates a separate bdi for each filesystem, and registers them in sysfs with "MAJOR:MINOR" of sb->s_dev (st_dev). This works fine for anon devices normally used by fuse, but can conflict with an already registered BDI for "fuseblk" filesystems, where sb->s_dev represents a real block device. In particularl this happens if a non-partitioned device is being mounted. Fix by registering with a different name for "fuseblk" filesystems. Thanks to Ioan Ionita for the bug report. Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> Reported-by: Ioan Ionita <opslynx@gmail.com> Tested-by: Ioan Ionita <opslynx@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-05-23Merge branch 'fixes' of ↵Linus Torvalds1-8/+0
git://git.kernel.org/pub/scm/linux/kernel/git/davej/cpufreq * 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/davej/cpufreq: [CPUFREQ] clarify license of freq_table.c [CPUFREQ] Remove documentation of removed ondemand tunable. [CPUFREQ] Crusoe: longrun cpufreq module reports false min freq [CPUFREQ] powernow-k8: improve error messages
2008-05-23doc: add a chapter about trylock functions [Bug 9011]Matti Linnanvuori1-0/+25
Add a chapter about trylock functions. http://bugzilla.kernel.org/show_bug.cgi?id=9011 Signed-off-by: Matti Linnanvuori <mattilinnanvuori@yahoo.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> (removed down_trylock)
2008-05-21[CPUFREQ] Remove documentation of removed ondemand tunable.Dave Jones1-8/+0
sampling_down_factor was removed in ccb2fe209dac9ff67f6351e783e610073afaaeaf back in June 2006. Signed-off-by: Dave Jones <davej@redhat.com>
2008-05-16Merge branch 'release' of ↵Linus Torvalds1-0/+6
git://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux-2.6 * 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux-2.6: [IA64] fix personality(PER_LINUX32) performance issue [IA64] Properly unregister legacy interrupts [IA64] Remove NULL pointer check for argument never passed as NULL. [IA64] trivial cleanup for perfmon.c [IA64] trivial cleanup for entry.S [IA64] fix interrupt masking for pending works on kernel leave [IA64] allow user to force_pal_cache_flush [IA64] Don't reserve crashkernel memory > 4 GB [IA64] machvec support for SGI UV platform [IA64] Add header files for SGI UV platform
2008-05-15[S390] Remove last traces of cio_msg=.Cornelia Huck1-3/+0
cio_msg= is gone, also remove it from kernel-parameters.txt. Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2008-05-15m68knommu: add info about removing mcfserialSebastian Siewior1-0/+8
Schedule a removal for this driver. Alternative driver is available for a while now. Signed-off-by: Sebastian Siewior <bigeasy@linutronix.de> Acked-by: Greg Ungerer <gerg@uclinux.org> Acked-by: Alan Cox <alan@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-05-15[IA64] allow user to force_pal_cache_flushAlex Chiang1-0/+6
The sequence executed in check_sal_cache_flush: - pend a timer interrupt - call SAL_CACHE_FLUSH - see if interrupt is still pending can hang HP machines with buggy SAL_CACHE_FLUSH implementations. Provide a kernel command-line argument to allow users skip this check if desired. Using this parameter will force ia64_sal_cache_flush to call ia64_pal_cache_flush() instead of SAL_CACHE_FLUSH. Signed-off-by: Alex Chiang <achiang@hp.com> Signed-off-by: Tony Luck <tony.luck@intel.com>
2008-05-15Merge git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/v4l-dvbLinus Torvalds2-2/+2
* git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/v4l-dvb: (70 commits) V4L/DVB (7900): pvrusb: Fix Kconfig if DVB=m V4L_core=y V4L/DVB (7899): Fixes a few remaining Kbuild issues at common/tuners V4L/DVB (7898): Fix VIDEO_MEDIA Kconfig logic V4L/DVB (7895): tveeprom: update Hauppauge analog audio and video decoders V4L/DVB (7893): xc5000: bug-fix: allow multiple devices in a single system V4L/DVB (7891): cx18/ivtv: fix open() kernel oops V4L/DVB (7890): cx18: removed bogus and confusing conditional V4L/DVB (7889): cx18: improve HVR-1600 detection. V4L/DVB (7888): cx18: minor card definition updates. V4L/DVB (7887): cx18: fix Compro H900 analog support. V4L/DVB (7881): saa7134: fixed a compile warning in saa7134-core.c V4L/DVB (7880): saa7134: remove explicit GPIO initialization V4L/DVB(7879): Adding cx18 Support for mxl5005s V4L/DVB(7878): mxl55005s: Makefile and Kconfig additions V4L/DVB(7877): mxl5005s: Ensure debug is off V4L/DVB(7876): mxl5005s: Remove incorrect copyright holders V4L/DVB(7875): mxl5005s: Remove redundant functions V4L/DVB(7874): mxl5005s: Fix function statics V4L/DVB(7873): mxl5005s: Fix header includes. V4L/DVB(7872): mxl5005s: checkpatch.pl compliance ...
2008-05-14read_barrier_depends arch fixletsNick Piggin1-1/+11
read_barrie_depends has always been a noop (not a compiler barrier) on all architectures except SMP alpha. This brings UP alpha and frv into line with all other architectures, and fixes incorrect documentation. Signed-off-by: Nick Piggin <npiggin@suse.de> Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-05-14V4L/DVB (7827): cx23885: add missing subsystem ID for Hauppauge HVR-1200 OEMMichael Krufky1-1/+1
Signed-off-by: Michael Krufky <mkrufky@linuxtv.org> Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
2008-05-14V4L/DVB (7823): em28xx: add additional usb subids for Hauppauge HVR-950Michael Krufky1-1/+1
Signed-off-by: Michael Krufky <mkrufky@linuxtv.org> Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
2008-05-13cgroups: fix documentationDhaval Giani1-2/+2
Correct the cgroups documentation to reflect the correct file names. Signed-off-by: Dhaval Giani <dhaval@linux.vnet.ibm.com> Cc: Sudhir Kumar <skumar@linux.vnet.ibm.com> Cc: Balbir Singh <balbir@in.ibm.com> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Acked-by: Paul Menage <menage@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-05-13adt7473: minor documentation updateDarrick J. Wong1-1/+2
Add a sentence about when fan speed increases to maximum. Signed-off-by: Darrick J. Wong <djwong@us.ibm.com> Acked-by: Jean Delvare <khali@linux-fr.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-05-11i2c: Improve the functionality documentationJean Delvare1-43/+52
Attempt to make the documentation about the I2C/SMBus functionality checking API clearer. Signed-off-by: Jean Delvare <khali@linux-fr.org>
2008-05-11i2c: Improve smbus-protocol documentationDavid Brownell1-35/+46
Improve the smbus-protocol documentation file somewhat: - Use the names of the SMBus protocol operations (from the 2.0 specification), not made-up-for-Linux names. - Add the name of the call used to execute each operation ... and point out that there are mismatches, where functions execute different protocol operations than their names specify. The most confusing examples are that "Read Byte" isn't executed by i2c_smbus_read_byte(), and that "Write Byte" isn't executed by i2c_smbus_write_byte(). When coding, that's not as bad as it may seem; but that case would seem to be worth fixing. Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Signed-off-by: Jean Delvare <khali@linux-fr.org>
2008-05-07[S390] cio: Remove cio_msg kernel parameter.Michael Ernst1-11/+0
The only sporadically used CIO_DEBUG messages are replaced by ordinary CIO_MSG_EVENT messages. The CIO_MSG_EVENT messages debug levels are consolidated. Signed-off-by: Michael Ernst <mernst@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2008-05-06[PATCH] kill ->put_inodeChristoph Hellwig2-6/+0
And with that last patch to affs killing the last put_inode instance we can finally, after many years of transition kill this racy and awkward interface. (It's kinda funny that even the description in Documentation/filesystems/vfs.txt was entirely wrong..) Also remove a very misleading comment above the defintion of struct super_operations. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2008-05-06Merge branch 'for-linus' of ↵Linus Torvalds1-165/+0
git://git.kernel.org/pub/scm/linux/kernel/git/mingo/linux-2.6-sched-fixes * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mingo/linux-2.6-sched-fixes: sched: default to n for GROUP_SCHED and FAIR_GROUP_SCHED sched: add optional support for CONFIG_HAVE_UNSTABLE_SCHED_CLOCK sched, x86: add HAVE_UNSTABLE_SCHED_CLOCK sched: fix cpu clock sched: fair-group: fix a Div0 error of the fair group scheduler sched: fix missing locking in sched_domains code sched: make clock sync tunable by architecture code sched: fix debugging sched: fix sched_info_switch not being called according to documentation sched: fix hrtick_start_fair and CPU-Hotplug sched: fix SCHED_FAIR wake-idle logic error sched: fix RT task-wakeup logic sched: add statics, don't return void expressions sched: add debug checks to idle functions sched: remove old sched doc sched: make rt_sched_class, idle_sched_class static sched: optimize calc_delta_mine() sched: fix normalized sleeper
2008-05-06sched: remove old sched docIngo Molnar1-165/+0
Fabio Checconi noticed that Documentation/scheduler/sched-design.txt was a stale copy of the old scheduler. Remove it. Reported-by: Fabio Checconi <fabio@gandalf.sssup.it> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-05-05Merge branch 'for-linus' of ↵Linus Torvalds1-0/+2
git://git.kernel.org/pub/scm/linux/kernel/git/jbarnes/pci-2.6 * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jbarnes/pci-2.6: x86 PCI: call dmi_check_pciprobe() x86/pci: add pci=skip_isa_align command lines. x86/pci: remove flag in pci_cfg_space_size_ext x86: fix section mismatch in pci_scan_bus
2008-05-05m68k: remove old mac_esp cruftFinn Thain1-3/+0
Remove the rest of the old mac_esp driver. Also ditch the rest of the machw mechanism, it needs to be replaced by a fake openfirmware tree. Signed-off-by: Finn Thain <fthain@telegraphics.com.au> Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-05-05x86/pci: add pci=skip_isa_align command lines.Yinghai Lu1-0/+2
so we don't align the io port start address for pci cards. also move out dmi check out acpi.c, because it has nothing to do with acpi. it could spare some calling when we have several peer root buses. Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
2008-05-05kgdb: minor documentation fixesgrzegorz.chwesewicz@chilan.com1-3/+5
Two minor fixes to the kgdb documentation. Signed-off-by: Grzegorz Chwesewicz, Chilan <grzegorz.chwesewicz@chilan.com> Signed-off-by: Jason Wessel <jason.wessel@windriver.com>
2008-05-04kconfig-language.txt: remove bogus hintAdrian Bunk1-24/+0
For the use case the hint describe a simple dependency is enough. Signed-off-by: Adrian Bunk <bunk@kernel.org> Acked-by: Randy Dunlap <randy.dunlap@oracle.com>
2008-05-03Merge branch 'for-linus' of ↵Linus Torvalds1-4/+6
git://git.kernel.org/pub/scm/linux/kernel/git/penberg/slab-2.6 * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/penberg/slab-2.6: slub: #ifdef simplification slabinfo: Support printout of the number of fallbacks slub: Whitespace cleanup and use of strict_strtoul
2008-05-03Merge git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpcLinus Torvalds1-0/+11
* git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc: [POWERPC] Bolt in SLB entry for kernel stack on secondary cpus [POWERPC] PS3: Update ps3_defconfig [POWERPC] PS3: Remove unsupported wakeup sources [POWERPC] PS3: Make ps3_virq_setup and ps3_virq_destroy static [POWERPC] PS3: Add time include to lpm [POWERPC] Fix slb.c compile warnings [POWERPC] Xilinx: Fix compile warnings [POWERPC] Squash build warning for print of resource_size_t in fsl_soc.c [RAPIDIO] fix current kernel-doc notation [POWERPC] 86xx: mpc8610_hpcd: add support for PCI Express x8 slot Fix a potential issue in mpc52xx uart driver [POWERPC] mpc5200: Allow for fixed speed MII configurations [POWERPC] 86xx: Fix the wrong serial1 interrupt for 8610 board
2008-05-03Merge git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6Linus Torvalds1-0/+22
* git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6: [SCSI] aic94xx: fix section mismatch [SCSI] u14-34f: Fix 32bit only problem [SCSI] dpt_i2o: sysfs code [SCSI] dpt_i2o: 64 bit support [SCSI] dpt_i2o: move from virt_to_bus/bus_to_virt to dma_alloc_coherent [SCSI] dpt_i2o: use standard __init / __exit code [SCSI] megaraid_sas: fix suspend/resume sections [SCSI] aacraid: Add Power Management support [SCSI] aacraid: Fix jbod operations scan issues [SCSI] aacraid: Fix warning about macro side-effects [SCSI] add support for variable length extended commands [SCSI] Let scsi_cmnd->cmnd use request->cmd buffer [SCSI] bsg: add large command support [SCSI] aacraid: Fix down_interruptible() to check the return value correctly [SCSI] megaraid_sas; Update the Version and Changelog [SCSI] ibmvscsi: Handle non SCSI error status [SCSI] bug fix for free list handling [SCSI] ipr: Rename ipr's state scsi host attribute to prevent collisions [SCSI] megaraid_mbox: fix Dell CERC firmware problem
2008-05-02lguest: make Launcher see device status updatesRusty Russell1-15/+35
This brings us closer to Real Life, where we'd examine the device features once it's set the DRIVER_OK status bit. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
2008-05-02virtio: de-structify virtio_block status byteRusty Russell1-6/+6
Ron Minnich points out that a struct containing a char is not always sizeof(char); simplest to remove the structure to avoid confusion. Cc: "ron minnich" <rminnich@gmail.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
2008-05-02slabinfo: Support printout of the number of fallbacksChristoph Lameter1-4/+6
Add functionality to slabinfo to print out the number of fallbacks that have occurred for each slab cache when the -D option is specified. Also widen the allocation / free field since the numbers became too big after a week. Signed-off-by: Christoph Lameter <clameter@sgi.com> Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
2008-05-01[POWERPC] mpc5200: Allow for fixed speed MII configurationsGrant Likely1-0/+11
Various improvements for configuring the MPC5200 MII link from the device tree: * Look for 'current-speed' property for fixed speed MII links * Look for 'fsl,7-wire-mode' property for boards using the 7 wire mode * move definition of private data structure out of the header file Signed-off-by: Grant Likely <grant.likely@secretlab.ca> Acked-by: Wolfgang Grandegger <wg@grandegger.com>
2008-05-01Merge branch 'release' of git://lm-sensors.org/kernel/mhoffman/hwmon-2.6Linus Torvalds1-1/+2
* 'release' of git://lm-sensors.org/kernel/mhoffman/hwmon-2.6: hwmon: (adt7473) minor cleanup / refactoring hwmon: (asb100) Remove some dead code hwmon: (lm75) Fix an incorrect comment hwmon: (w83793) VID and VRM handling cleanups hwmon: (w83l785ts) Don't ask the user to report failures hwmon: (smsc47b397) add a new chip id (0x8c)
2008-05-01kexec: make extended crashkernel= syntax less confusingMichael Ellerman1-1/+4
The extended crashkernel syntax is a little confusing in the way it handles ranges. eg: crashkernel=512M-2G:64M,2G-:128M Means if the machine has between 512M and 2G of memory the crash region should be 64M, and if the machine has 2G of memory the region should be 64M. Only if the machine has more than 2G memory will 128M be allocated. Although that semantic is correct, it is somewhat baffling. Instead I propose that the end of the range means the first address past the end of the range, ie: 512M up to but not including 2G. [bwalle@suse.de: clarify inclusive/exclusive in crashkernel commandline in documentation] Signed-off-by: Michael Ellerman <michael@ellerman.id.au> Acked-by: Bernhard Walle <bwalle@suse.de> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Cc: Simon Horman <horms@verge.net.au> Signed-off-by: Bernhard Walle <bwalle@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-04-30Merge branch 'release' of ↵Linus Torvalds2-23/+149
git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux-acpi-2.6 * 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux-acpi-2.6: (179 commits) ACPI: Fix acpi_processor_idle and idle= boot parameters interaction acpi: fix section mismatch warning in pnpacpi intel_menlo: fix build warning ACPI: Cleanup: Remove unneeded, multiple local dummy variables ACPI: video - fix permissions on some proc entries ACPI: video - properly handle errors when registering proc elements ACPI: video - do not store invalid entries in attached_array list ACPI: re-name acpi_pm_ops to acpi_suspend_ops ACER_WMI/ASUS_LAPTOP: fix build bug thinkpad_acpi: fix possible NULL pointer dereference if kstrdup failed ACPI: check a return value correctly in acpi_power_get_context() #if 0 acpi/bay.c:eject_removable_drive() eeepc-laptop: add hwmon fan control eeepc-laptop: add backlight eeepc-laptop: add base driver ACPI: thinkpad-acpi: bump up version to 0.20 ACPI: thinkpad-acpi: fix selects in Kconfig ACPI: thinkpad-acpi: use a private workqueue ACPI: thinkpad-acpi: fluff really minor fix ACPI: thinkpad-acpi: use uppercase for "LED" on user documentation ... Fixed conflicts in drivers/acpi/video.c and drivers/misc/intel_menlow.c manually.
2008-04-30Merge branches 'release', 'acpica', 'bugzilla-10224', 'bugzilla-9772', ↵Len Brown102-2016/+4693
'bugzilla-9916', 'ec', 'eeepc', 'idle', 'misc', 'pm-legacy', 'sysfs-links-2.6.26', 'thermal', 'thinkpad' and 'video' into release
2008-04-30Merge branch 'master' of ↵Linus Torvalds1-0/+12
git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc * 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc: [POWERPC] Fix crashkernel= handling when no crashkernel= specified [POWERPC] Make emergency stack safe for current_thread_info() use [POWERPC] spufs: add .gitignore for spu_save_dump.h & spu_restore_dump.h [POWERPC] spufs: trace spu_acquire_saved events [POWERPC] spufs: fix marker name for find_victim [POWERPC] spufs: add marker for destroy_spu_context [POWERPC] spufs: add sputrace marker parameter names [POWERPC] spufs: add context switch notification log [POWERPC] mpc5200: defconfigs for CM5200, Lite5200B, Motion-PRO and TQM5200 [POWERPC] mpc5200: Switch mpc5200 dts files to dts-v1 format [POWERPC] mpc5200: Fix FEC error handling on FIFO errors [POWERPC] mpc5200: add Phytec pcm030 board support [POWERPC] mpc5200: add gpiolib support for mpc5200 [POWERPC] mpc5200: add interrupt type function [POWERPC] mpc5200: Fix unterminated of_device_id table
2008-04-30debugobjects: add documentationThomas Gleixner2-1/+392
Add a DocBook for debugobjects. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Ingo Molnar <mingo@elte.hu> Cc: Greg KH <greg@kroah.com> Cc: Randy Dunlap <randy.dunlap@oracle.com> Cc: Kay Sievers <kay.sievers@vrfy.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-04-30infrastructure to debug (dynamic) objectsThomas Gleixner1-0/+2
We can see an ever repeating problem pattern with objects of any kind in the kernel: 1) freeing of active objects 2) reinitialization of active objects Both problems can be hard to debug because the crash happens at a point where we have no chance to decode the root cause anymore. One problem spot are kernel timers, where the detection of the problem often happens in interrupt context and usually causes the machine to panic. While working on a timer related bug report I had to hack specialized code into the timer subsystem to get a reasonable hint for the root cause. This debug hack was fine for temporary use, but far from a mergeable solution due to the intrusiveness into the timer code. The code further lacked the ability to detect and report the root cause instantly and keep the system operational. Keeping the system operational is important to get hold of the debug information without special debugging aids like serial consoles and special knowledge of the bug reporter. The problems described above are not restricted to timers, but timers tend to expose it usually in a full system crash. Other objects are less explosive, but the symptoms caused by such mistakes can be even harder to debug. Instead of creating specialized debugging code for the timer subsystem a generic infrastructure is created which allows developers to verify their code and provides an easy to enable debug facility for users in case of trouble. The debugobjects core code keeps track of operations on static and dynamic objects by inserting them into a hashed list and sanity checking them on object operations and provides additional checks whenever kernel memory is freed. The tracked object operations are: - initializing an object - adding an object to a subsystem list - deleting an object from a subsystem list Each operation is sanity checked before the operation is executed and the subsystem specific code can provide a fixup function which allows to prevent the damage of the operation. When the sanity check triggers a warning message and a stack trace is printed. The list of operations can be extended if the need arises. For now it's limited to the requirements of the first user (timers). The core code enqueues the objects into hash buckets. The hash index is generated from the address of the object to simplify the lookup for the check on kfree/vfree. Each bucket has it's own spinlock to avoid contention on a global lock. The debug code can be compiled in without being active. The runtime overhead is minimal and could be optimized by asm alternatives. A kernel command line option enables the debugging code. Thanks to Ingo Molnar for review, suggestions and cleanup patches. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@elte.hu> Cc: Greg KH <greg@kroah.com> Cc: Randy Dunlap <randy.dunlap@oracle.com> Cc: Kay Sievers <kay.sievers@vrfy.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-04-30Basic braille screen reader supportSamuel Thibault2-0/+39
This adds a minimalistic braille screen reader support. This is meant to be used by blind people e.g. on boot failures or when / cannot be mounted etc and thus the userland screen readers can not work. [akpm@linux-foundation.org: fix exports] Signed-off-by: Samuel Thibault <samuel.thibault@ens-lyon.org> Cc: Jiri Kosina <jikos@jikos.cz> Cc: Dmitry Torokhov <dtor@mail.ru> Acked-by: Alan Cox <alan@redhat.com> Cc: Randy Dunlap <randy.dunlap@oracle.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-04-30mm: document missing fields for /proc/meminfoMiklos Szeredi1-4/+17
A few fields in /proc/meminfo were not documented. Fix. Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-04-30mm: bdi: move statistics to debugfsMiklos Szeredi1-28/+15
Move BDI statistics to debugfs: /sys/kernel/debug/bdi/<bdi>/stats Use postcore_initcall() to initialize the sysfs class and debugfs, because debugfs is initialized in core_initcall(). Update descriptions in ABI documentation. Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-04-30mm: bdi: allow setting a maximum for the bdi dirty limitPeter Zijlstra1-1/+8
Add "max_ratio" to /sys/class/bdi. This indicates the maximum percentage of the global dirty threshold allocated to this bdi. [mszeredi@suse.cz] - fix parsing in max_ratio_store(). - export bdi_set_max_ratio() to modules - limit bdi_dirty with bdi->max_ratio - document new sysfs attribute Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-04-30mm: bdi: allow setting a minimum for the bdi dirty limitPeter Zijlstra1-0/+6
Under normal circumstances each device is given a part of the total write-back cache that relates to its current avg writeout speed in relation to the other devices. min_ratio - allows one to assign a minimum portion of the write-back cache to a particular device. This is useful in situations where you might want to provide a minimum QoS. (One request for this feature came from flash based storage people who wanted to avoid writing out at all costs - they of course needed some pdflush hacks as well) max_ratio - allows one to assign a maximum portion of the dirty limit to a particular device. This is useful in situations where you want to avoid one device taking all or most of the write-back cache. Eg. an NFS mount that is prone to get stuck, or a FUSE mount which you don't trust to play fair. Add "min_ratio" to /sys/class/bdi. This indicates the minimum percentage of the global dirty threshold allocated to this bdi. [mszeredi@suse.cz] - fix parsing in min_ratio_store() - document new sysfs attribute Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-04-30mm: bdi: export BDI attributes in sysfsPeter Zijlstra1-0/+46
Provide a place in sysfs (/sys/class/bdi) for the backing_dev_info object. This allows us to see and set the various BDI specific variables. In particular this properly exposes the read-ahead window for all relevant users and /sys/block/<block>/queue/read_ahead_kb should be deprecated. With patient help from Kay Sievers and Greg KH [mszeredi@suse.cz] - split off NFS and FUSE changes into separate patches - document new sysfs attributes under Documentation/ABI - do bdi_class_init as a core_initcall, otherwise the "default" BDI won't be initialized - remove bdi_init_fmt macro, it's not used very much [akpm@linux-foundation.org: fix ia64 warning] Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Kay Sievers <kay.sievers@vrfy.org> Acked-by: Greg KH <greg@kroah.com> Cc: Trond Myklebust <trond.myklebust@fys.uio.no> Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-04-30Deprecate find_task_by_pid()Pavel Emelyanov1-0/+18
There are some places that are known to operate on tasks' global pids only: * the rest_init() call (called on boot) * the kgdb's getthread * the create_kthread() (since the kthread is run in init ns) So use the find_task_by_pid_ns(..., &init_pid_ns) there and schedule the find_task_by_pid for removal. [sukadev@us.ibm.com: Fix warning in kernel/pid.c] Signed-off-by: Pavel Emelyanov <xemul@openvz.org> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by: Sukadev Bhattiprolu <sukadev@us.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-04-30docbook: fix fatal rapidio yet again (and more to come)Randy Dunlap1-1/+0
Don't refer to file that no longer exists: docproc: linux-2.6.25-git14/arch/powerpc/kernel/rio.c: No such file or directory Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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